Screw-cutting stock and die.



No. 674,l05. Patented May'l4,- I90l. E. TIMM.

SCREW CUTTING STOCK AND DIE.

(Application filed Nov. 8, 1900.)

(No llo' del.)

ummn Eg/u Jjmm UNITED STATES PATENT OFFICE.

EZRA TIMM, OF OSCEOLA, NEBRASKA.

SCREW-CUTTING STOCK 'AND DIE.

SPECIFICATION forming part of Letters Patent No. 674,105, dated May 14,1901.-

Application filed November 8, 1900. v b 'erial No. 35.8 (No model.)

To all whom it may concern:

Be it known that I, EZRA TIMM, a citizen of the United States, residingat Osceola, in the county of Polk and State of Nebraska, have inventedcertain new and useful Improvements in Screw-Cutting Stocks and Dies;and I do declare the following to be a full, clear, and exactdescription of the invention, such as will enable others skilled in theart to which it appertains to make'and use the same.

This invention relates to improvements in screw cutting stocks and diesfor screwthreading pipes, rods, and other like objects. The inventionhas for its object to provide a die-stock which may be quickly appliedand removed and accurately adjusted, to provide improved means forsecuring the dies to the stock to adapt the same to be easily andexpeditiously attached and detached, to provide for the use of auxiliarydies in connection with the main dies for threading smaller objects thansaid main dies are adapted for,

and to generally simplify and improve the construction and increasethe-practical efficiency of devices of this character.

With this and other minor objects inview the invention consists ofcertain novel features of construction, combination, and arrangement ofparts, as will be hereinafter more fully described, and particularlypointed out in the appended claims.

In the accompanyingdrawings, Figure 1 is a perspective view'of ascrew-threadingdevice embodying my invention, showing the jaws of thestock open. Fig. 2 is a sectional view on line 2 2 of Fig. 1, showing.the jaws closed. Fig. 3 is asection through one. of the jaws and maindies on line of the dovetailed rib and dowel-pin. Fig'. 4 is a frontelevation of one of the die members. Fig. 5 is a rear perspective viewthereof.

Referring now more particularly to the ,drawings, the numerals 1 and 2represent the semicircular jaws of an ordinary split diestock, each ofwhich is provided with a socket 3 for the reception ofanoperating-handle 4, whereby the device is turned on the pipe or rod tobe threaded. At one side of the stock the meeting ends of the jaws arehinged or piyotally connected by a pivot pin or bolt 5, and the oppositeor free ends of the jaws are provided with spaced pairs of lugs 6 and 7.

Between the lugs 6is pivoted a locking-bolt 8, which is adapted to swingdown between the lugs 7 and to be held in such position to thereon andadapted to, bear upon the outer faces of said lugs 7. When it is desiredto open the jaws, the nut is loosened and the bolt thrown back, as shownin Fig. 1. v To prevent the bolt from moving too far back, the pivotedend thereof is formed with a cam-head 10, which binds upon the jaw andalso abuts against a stop-shoulder 11, thereby prevent ing the bolt frompassing rearward of a position perpendicular to its axis. The pivot pinor bolt 5 is preferably tapered, so that it may be adjusted tocompensate for wear and provide for a close fitting at all times of thehinged end of the jaws.

The dies 12 and 13, which for convenience of description will behereinafter termed the main dies, are adapted to be secured to the jawsto open and close to admit the pipe or other object to be threadedbetween them with the thread-cutting.portionsor die-faces 14. These diefaces extend part way across the meeting faces of the main dies andterminate alongside dovetailed sockets 15, 0ccupying the remainingtransverse extent of said meeting faces. In these sockets are are gagedto thread smaller-sized objects than the said die-faces 14, and saidauxiliary dies are adjustable outwardly through the meit is desired tothread pipes or rods of smaller diameter than the main dies are designedfor the sockets 15, thus adapting the "device to be quickly andconveniently fitted for threading rods or'pipes of difierent sizes. 1

The main dies 12 and 13 are soon red in such a manner as to facilitatetheir application dies is provided on itsconvex face-with a dovetailedrib 18 and dowel-pin 19', located rib 18 is adapted toenter a dovetailedgroove 21, formed on the inner face of the cooperating jaw of the stock,the said groove 20 being lock the jaws closed by a wing-nut 9, tappedand to release said pipe and are proyided,

slidably fitted dovetailed auxiliary dies 16,. whose thread-cuttingportions or die-faces and removal, and to this end each of said at oradjacent to opposite ends thereof. Thediu'm oftapered adj usting-screws17. When 20 and the dowel-pin 19 to enter a seat-groove 9 threading, theauxiliary dies are slipped into located at the free end of the jaw andthe seat-groove 21 at the hinged end thereof. To apply the main die tothe jaw, the inner end of the rib is first slipped into the groove 20and slid downward until the pin 19 comes in line with the upper end ofthe seat-groove 21, when the pin is fitted in said seat'groove and thedie then slid downward into proper position. By this construction asimple and secure fastening is provided and the main die adapted to bereadily and quickly connected to and disconnected from the jaw.

From the foregoing description, taken in connection with theaccompanying drawings, the construction, mode of operation, andadvantages of the invention will be readily understood, and it will beseen that a convenient and efficient form of threading implement isprovided.

Changes in the form, proportion, and minor details of construction maybe made within the scope of the invention without departing from thespirit or sacrificing any of the advantages thereof.

Having thus fully described my invention, what I claim, and desire tosecure by Letters Patent, is-- 1. In a screw-threading device, the combination of a stock having hinged segmental jaws provided on their innerfaces with upper and lower grooves, the upper grooves be ing dovetailed,and segmental dies having dovetailed ribs to engage the upper groovesand dowel-pins to engage the lower grooves, substantially as set forth.

2. In a screw-threading stock and die, the combination of a stock havinghinged segmental jaws provided on their inner faces with upper and lowergrooves, the upper grooves being dovetailed, segmental dies havingdovetailed ribs to engage the upper grooves, and dowel-pins to engagethe lower grooves, said dies being also provided with a screw-threadingsurface extending part way across the face thereof, a dovetailed socketoccupying the remaining extent of said face and open to the exterior onone side, an auxiliary screw-threaded die having dovetailed portions tofit within said socket, and a tapered screw for securing said auxiliarydie, substantially as described.

In testimony whereof I have hereunto set my hand in presence of twosubscribing witnesses.

EZRA TIMM.

Witnesses:

W. S. MILLER, A. A. GRAY.

